Cities across the globe have been designed with a primary goal of moving people around quickly—and the costs are becoming ever more apparent. The consequences are measured in smoggy air basins, sprawling suburbs, a failure to stem traffic congestion, and...

As cities strive to become more sustainable, livable, and healthy, they are increasingly becoming multi-modal. In 2014, Americans took 10.8 billion trips on public transit, the highest since the dawn of the highway era. But most of these trips are on...